Exercise Machine Elliptical

I can only buy / have room for a treadmill. I've been looking at the rowing machines, treadmills, exercise bikes, elliptical cross trainers. What should I do to tone the whole body or at least only my butt, thighs and stomach? I have 19 years old and weighs 126 pounds I lose about 10-15 pounds and tone. swim! You should walk your dog. rower or elliptical is best for all three parts bikes mainly doing thighs. xx I like elliptical. It can be configured for different things, and works all parts of the legs and stomach when you have high ramp. If I were buying a machine, I want to go.